Valve



(No Model.)

E. F. WILLIAMS.

VALVE.

Patented June 19, 1888.

ATTORNEYS,

www", wnmngm. '0. c

UNITED STATES PATENT OFFICE.

EDWIN F. WILLIAMS, OF CHICAGO, ILLINOIS.

VALVE.

SPECIFICATION ,forming part of Letters Patent No. 384,883, dated June 19, 1888.

Application tiled August 20, 1887. Serial No. 247,486. (No model.)

To all whom, it may concern.'

Be it known that I, EDWIN F. WILLIAMs, a citizen of the United States, and residing at Chicago,in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Valves, which is fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure l is a sectional View of a, mechanism embodying my invention, taken on the line l 1 of Fig. 2; Fig. 2, a plan view of'the same, one-half in section; Fig. 3, a transverse sectional view taken on the line 2 2 of Fig. l; Fig. 4, a detail sectional view taken on the line 3 3 of Fig. l, with the pressure-plate removed; Fig. 5,/a detail view of the packing detached, and Fig. 6 a detail plan view of one of the pressure-plates detached.

Like letters refer to like parts in all the figures of the drawings.

My invention relates to valves for steamengines, and has for its object to provide an improved form of pressure-plate for the slidevalve of the steam-engine, which shall possess various advantages of construction and operation, which will be hereinafter more particularly pointed out.

My present invention is in the general nature of an improvement upon Letters Patent No. 350,650, granted to me October 12, 1886.

I will now proceed to describe a construction in which I have practically carried out my invention in one form, and will then particularly point out in the claims those features which I deem to be new and desireto protect by Letters Patent. i

In the drawings, A represents the steami chest, which is preferably divided at any suitable point-as, for instance, in the case shown, along the line ofthe top of the valve, so that the upper portion or cap, A', is removable. IIhe steam-chest A is provided with a central space, a, into which the live steam is admitted through the supply-pipe B. At each end 0f this central space isla valve seat, a', the steamports C and C opening into the said valveseats in the usual manner. At each side of the valveseats a are arranged distance-ledges 5o D, of a height equal to the' valve and of a length equal to that of the valve-seat. Be-

yond the valve-seats a', at each end of the steam-chest, is an exhaust-passage, c, each passage being provided with an exhaust-pipe, c.

E represents the valve,which is constructed substantiallyas in my prior Letters Patent referred to.` In the present instance, however, the cutoff valve has been omitted in order to simplify the construction. `In this simplified form the valve consists of a transverse bar or plate, E, at each end extending across the valve-seat from side to side thereof, having a height equal to the height of the distance-ledges D and a width equal to about one-half the width of the valveseat. The two portions are connected to each other by bars E2, or in any other suitable manner, and the whole valve is actuated by the valve.-

stem E3. Through each end of the valve a steam-port, e, passes from top to bottom there-` of, as clearly shown in Figs. l and 2. At one side of the valvea vertical groove, e', is formed, and a key or gib, e, backed by a spring, e3, is arranged in said groove to form a packing, and thus keep the valve tight atthe sides.

The pressure-plates are shown at F. These i pressureplates rest upon the distance-ledges D, and may be secured thereto, if desired, by screw-bolts d. Each pressure-plate is provided on its under sidewith a cavity, f, eX-

SoI

actly opposite and equal in length and width to the corresponding steam-port.

The exy posed under surface of the pressure-plate isof i the same dimensions as the upper surface of the valve-seat, so that the valve-seat and the pressure-plate present two exactly equal and opposite faces, between which the valve works freely. The end of the steam-chest adjacent to each pressure-plateis provided with a ledge,

f', having a smooth bearing-surface, against which the pressure-plate is held by the press-` ure of the steam within the space a.

It will be observed that the only points of IOC -serious damage will result from putting them down in full force on the valve. In this manner the valves Will Wear themselves tight and free, thus making a close t and at the same time insuring freedom of movementwithout leakage.

It is obvious that various modifications may be made in the details of construction and arrangement of thevparts Without departing' from the principle of my invention, and I therefore do not Wish to be understood as limiting myself strictly to the precise details hereinbefore described,and shown in the drawings.

Having thus described my invention, What I claim as new, and desire to secure byLetters Patent, is-

.1. The combination, with the steam-chest provided with the central live-steam space and exhaust-steam spaces at each end, with end-bearing ribs above the same, of the independent pressure-plates, arranged one at each end of the chest within the central space above the valve and held against the bearing-ribs by the steam-pressure, substantially as and for the purposes specified.

2. ,The combination7 -With the steam-chest A, having valve-seats a, distance-ledges D on each side of each valve-seat, and bearing-ribs f', one at each end, of the valve E, having a height equal to lthat of the distance-ledges, and the pressure-plates F, mounted on the distanceledges and bearing against the ribs f', io substantially as and for the purposes specified.

EDWIN F. WILLIAMS.

Witnesses: v

ORsoN H. BROOKE, IRVINE MILLER. 

